Certbot - About Certbot. certbot.eff.org [online]. [cit. 2019-07-02]. Dostupné v archivu pořízeném z originálu dne 2019-06-29. (anglicky)
github.com
Certbot is EFF's tool to obtain certs from Let's Encrypt and (optionally) auto-enable HTTPS on your server. It can also act as a client for any other CA that uses the ACME protocol.: cert... github.com [online]. 2019-07-02 [cit. 2019-07-02]. Original-date: 2014-11-12T02:52:20Z. Dostupné online.
keycdn.com
9 Popular Nginx Commands You Should Know - KeyCDN Support. KeyCDN [online]. [cit. 2019-07-02]. Dostupné online. (anglicky)